Scream singing

I've been reading a lot about this and practising quite a bit too, but one thing remains completely unclear to me. I'm told to direct the vibration to my soft palate. Says I should feel the resonance there and not in my vocal cords, but in all honesty, I can't tell either way if I'm doing it right. I don't want to damage my voice and I want it to sound right but how can I tell if I'm using my soft palate or not?